LZBindingListener


1   /* *****************************************************************************
2    * LZBindingListener.java
3    * ****************************************************************************/
4   
5   /* J_LZ_COPYRIGHT_BEGIN *******************************************************
6   * Copyright 2001-2004 Laszlo Systems, Inc.  All Rights Reserved.              *
7   * Use is subject to license terms.                                            *
8   * J_LZ_COPYRIGHT_END *********************************************************/
9   
10  package org.openlaszlo.servlets;
11  
12  import java.io.File  ;
13  import java.util.HashSet  ;
14  import java.util.Iterator  ;
15  import javax.servlet.ServletContext  ;
16  import javax.servlet.http.HttpSessionBindingEvent  ;
17  import javax.servlet.http.HttpSessionBindingListener  ;
18  import org.apache.log4j.*;
19  
20  /**
21   * This class implements an HttpSessionBindingListener and is used to remove
22   * temporary session files.<p>
23   */
24  public class LZBindingListener
25      implements HttpSessionBindingListener  
26  {
27      /**
28       * Logger 
29       */
30      private static Logger mLogger  = Logger.getLogger(LZBindingListener.class);
31  
32      /**
33       * Store temporary filename to remove during valueUnbound().
34       */
35      HashSet   mTempFileNameSet;
36  
37      /**
38       * Constructor.
39       */
40      public LZBindingListener(String   fileName)
41      {
42          mTempFileNameSet = new HashSet  ();
43          addTempFile(fileName);
44      }
45  
46      /**
47       * At the moment, don't do anything when value is bound, aside from loggin
48       * session id.
49       */
50      public void valueBound(HttpSessionBindingEvent   event) 
51      {
52          mLogger.info("SessId bound " + event.getSession().getId());
53      }
54  
55      /**
56       * Remove the file when session value is unbound.
57       */
58      public synchronized void valueUnbound(HttpSessionBindingEvent   event) 
59      {
60          mLogger.info("SessID unbound " + event.getSession().getId());
61  
62          // Remove all temporary files.
63          Iterator   iter = mTempFileNameSet.iterator();
64          while (iter.hasNext()) {
65              String   fileName = (String  )iter.next();
66              File   file = new File  (fileName);
67              file.delete();
68          }
69          mTempFileNameSet.clear();
70      }
71  
72  
73      /**
74       * Add a temporary file name to remove when unbinding.
75       */
76      public synchronized void addTempFile(String   fileName)
77      {
78          if (fileName == null || fileName.length() == 0)
79              return;
80  
81          if (! mTempFileNameSet.contains(fileName))
82              mTempFileNameSet.add(fileName);
83      }
84  
85  
86      /**
87       * Deletes a requested temporary file. 
88       */
89      public synchronized boolean delTempFile(String   fileName) 
90      {
91          if (fileName != null && mTempFileNameSet.contains(fileName)) {
92              mTempFileNameSet.remove(fileName);
93              File   file = new File  (fileName);
94              return file.delete();
95          }
96  
97          return false;
98      }
99  
100 }
101
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